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MX 3000a early clip?
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xz_vice View Drop Down
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Joined: 11 April 2025
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Points: 5 		Post Options Post Options   Thanks (0) Thanks(0)   Quote xz_vice Quote  Post ReplyReply Direct Link To This Post Posted: 07 March 2026 at 6:20am
Originally posted by kedwardsleisure kedwardsleisure wrote:


are the step driver boards showing the correct LED sequence? I would swap one over with the one on the other channel and see if the board itself is the problem


How do i know the correct led sequence? Is there some kind of diagnostics procedure to follow regarding these daughter boards?

Also my problem is related to the negative rail, as I tried to bypaas the gain reduction stage, and the positive rail was full, while the negative rail was clipping to the first rail (40V or so, so the second rail wasnt activating)

Also, the daughter boards PCBs are burnt as hell (the back of the pcb became brown, probably because of a design issue? 😅)

Originally posted by kedwardsleisure kedwardsleisure wrote:


The amp uses grounded bridge topology, which means faults on the positive half of the waveform can be caused by the negative drive. This is becuase the output section ground-references the power supply rails, and the power supply centre point becomes the output.


I am not really experienced so I don't know how the amp works 😅, but yeah i figured out the output is the central point of the Power supply and that was really weird to me...
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Greg32 View Drop Down
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Points: 120 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Greg32 Quote  Post ReplyReply Direct Link To This Post Posted: 08 March 2026 at 3:25am
uploads/417/QSC_SH-000009-00.pdf
hope the attachments work, Greg
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xz_vice View Drop Down
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Points: 5 		Post Options Post Options   Thanks (0) Thanks(0)   Quote xz_vice Quote  Post ReplyReply Direct Link To This Post Posted: 08 March 2026 at 6:23am
Originally posted by Greg32 Greg32 wrote:

uploads/417/QSC_SH-000009-00.pdf - uploads/417/QSC_SH-000009-00.pdf
uploads/417/QSC_SH-000008-00.pdf - u uploads/417/QSC_SH-000008-00.pdf - ploads/417/QSC_SH-000008-00.pdf
hope the attachments work, Greg

Heyyy!! Tysm! Do you happen to have also the schematic for the big smd pcb that controls clipping, protections and so on? It'd be great 😅
It's called IC-000010-00 iirc 🤔

Also, is there a check procedure that mentions also the led sequence of the SMD driver boards?
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Greg32 View Drop Down
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Points: 120 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Greg32 Quote  Post ReplyReply Direct Link To This Post Posted: 08 March 2026 at 7:29am
uploads/417/QSC_SH-000010-00.pdf
this one, Greg
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Greg32 View Drop Down
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Points: 120 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Greg32 Quote  Post ReplyReply Direct Link To This Post Posted: 08 March 2026 at 7:31am
uploads/417/qsc_mx3000a_sm.pdf
this is all i have, Greg
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Points: 5 		Post Options Post Options   Thanks (0) Thanks(0)   Quote xz_vice Quote  Post ReplyReply Direct Link To This Post Posted: 10 March 2026 at 10:12am
Originally posted by Greg32 Greg32 wrote:

uploads/417/qsc_mx3000a_sm.pdf - uploads/417/qsc_mx3000a_sm.pdf
this is all i have, Greg

Heyyy!! Thank you so so much! Super useful! 🙏🏻 When i will have enough free time i will start investigating the issue 👍🏻💪🏻
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